Camelbak spire 22 lumbar reservoir description its not just the weight of your pack its how you carry it the spire tm keeps the weight and the sweat off your back thanks to a lumbar reservoir and suspended mesh back panels the reservoir stores your hydration near your hips for greater stability on the trail and the mesh nv panels keep your back cool and ventilated no matter how rugged the climb the spire is also engineered to fit women ergonomically with an s curved harness that